I'm not sure if his appearance is weighted in each tier or dungeon type, but he definitely doesn't seem completely random.
I remember not seeing him for a week or two and then saw him several times a day this past week.
Try The Meal Prep Manual.
It's somewhat annoying in that you need to sign up for a free account to get access to some of the recipes but the macro/calorie sliders are very handy.
I've never tried a WH40k game, might as well enter and try a beta for free to see if I like it.
If you chose to back Lilith, the eternal conflict would've ended...with her winning and everyone else losing. I'm not sure why there are so many Lilith supporters, Guulrahn made it pretty clear she doesn't care about humans and is just using them as a tool for her own power.